Pitman for pumping-jacks.



F. H. & D. E. NORRIS.

PITMAN FOR PUMPING JACKS.

APPLlCATlON FILED FEB. 3. 1913 Patented Dec. 28, 1915.

FRANK H. NORRIS AND nnlvrnl. n. nonnrs, or noel neon, lnn no s,

PITMAN non re nstate-me ts.

m ns s.

Application filed February 3, 1913;

To all whom it may concern.

Be it known that we, FRANK H. Nonnis and DANIEL E. Nonnrs, citizens of the United States, residing at Robinson, in the county of Crawford and State of Illinois, have in vented new and useful Improvements in Pitmen for Pumping-Jacks, of which the following is a specification.

This invention relates to pitmen for pumping jacks and consists in certain improvements in the construction thereof as will be hereinafter fully described .and pointed out in the claims.

In the pumping of oil wells and the like it is common practice to use what is known as a pumping jack and to communicate the movement of the pumping jack to the beam operating the pump by means of a pitman and it is this pitman with its bearings that forms the subject of this invention.

The invention is illustrated in the accompanying drawings as follows Figure 1 shows a side elevation of a pumping jack, the pitman forming the invention in place thereon, the bearings of the pitman being in section to better show construction. Fig. 2 is a perspective view of the top bearing member. Fig. 3 is a perspective view of the upper pitman bearing member. Fig. 1 is a perspective view ofthe lower pitman bearing member. Fig. 5 is a perspective view of the bottom bearing member.

1 marks the horizontal member of the pumping jack, 2 the vertical member, 3 the removable member of the bearing for the jack and 4c the stationary member, the stationary member being secured to the sill 5 in the usual manner. The jack is operated by the pull rod 6.

The bottom bearing member has the plate 7 which is secured to the horizontal member of the jack by the bolts 8 which extend through the perforations 9 in the plate. This bottom bearing member has the concave cylindrical wearing surface 10 from which extends an oil cavity 11 which communicates with the cup formed by the cylindrical surface 10. Ears 12 extend upwardly from the ends of the bearing surface 10 and these have the inwardly projecting pins or lugs 13.

The lower pitman bearing member has a socket 15 in which the pitman rod 14 extends. The rod is secured in the socket by a set screw 16. It has the external or con- Specification of Letters Patent.

P t d Dec 1 19 5- Serial l te. 745,850.

vex cylindrical wearing surface 17 which is adapted to operate on the concave bearingsurface 10. Radial slots 18 are arranged in the ends of the portion carrying the bean ng surface 17. These slots are at right allgles to the direction of strain and are adapted to. receive the pins 13.. The bearing can be assembled by turning the pitman to a horizontal position and in this position the pins will slip into the slots and then by swing.- ing the pitman to an upright position the p-itman bearing member is. locked in the bot tom member with the surface 17 in position to engage and operate on the surface 10- T c pper pitmall b ar gmember 19 has a socket 19 into which the rod let extends. It is secured in the socket by a set screw 20.. The member has the concave cylindrical bearing surface 21 in its upper face and the oil cavities 22 extend laterally from the bearingsurface and communicate with it so as to carry lubricant to the surface. Ears 23 are arranged at the ends of the surface 21 and have the pins 24 which operate in the manner of the pins 13,. The top bearing member 25 has a securing plate 25 which is arranged on the bottom of the walking beam 30. It is secured to the beam by the bolts 26 which extend through the perforations 27. The member 25 has the convex cylindrical bearing surface 28 extending downwardly and in position to operate in conjunction with the bearing surface 21. At the ends of the surface 28 the bearing member 25 has the slots 29 which are arranged at right angles to the direction of the rod 1-": when the parts are assembled By turning the parts at right angles to the normal position the slots 29 permit the placing of the member 25 in place in the member 19 then by turning it to its normal position the pins 24 lock the member 25 with the member 19. It will be understood that nearly all of the wear of these bearings comes from thrust on the pitman, or in other words, on the up-stroke. It will be observed that these bearings afford a large surface for taking this wear and at the same time both bearings have the concave member opening upwardly so as to readily hold a lubricant and this is especially convenient with relation to the cavities 11 and 22 for storing the lubricant.

The walking beam 30 is connected to the pump rod 31 by means of a trunnion 32 in the usual manner and the walking beam is journaled to the post 33 by a pin 3 in the usual manner.

What is claimed as new is 1. In a pitman for pumping jacks, the combination of a pitman rod; a lower rod bearing member secured to the lower end of the rod having a convex bearing surface; a bottom bearing member having a concave bearing surface in which the lower rod bearing member is journaled; said bearing surface having a communicating oil receptacle, an upper rod bearing member having a concave bearing surface; said bearing surface having a communicating oil receptacle, and a top'bearing member having a convex bearing surface and journaled in the upper rod bearing member.

2. In a pitman for pumping jacks, the combination of a pitman rod; and a bearing for the end of the rod comprising a first member having a convex bearing surface and having radial slots at its ends and arranged at an angle to the normal line of force exerted on the pitman; and a second bearing member havin a concave bearing surface with closed ends and with pins extending inwardly at its ends and in the direction of the axis of the bearing and adapt ed to enter the slots in the first member.

3. In a pitman for pumping jacks, the combination of a pitman rod; and a bearing for the end of the rod comprising a first member with a convex bearing surface having radial slots at each end and arranged Copies of this patent may be obtained for at an angle to the normal line of force on the bearing; and a second member having a concave bearing surface with ears closlng 1ts ends and inwardly extending pins extending from the ears 1n the direction of the axis of the bearing and adapted to enter the slots in the first member.

at. In a pitman for pumping jacks, the combination of a pitman rod; a lower rod bearing member secured to the lower end of the rod having a'convex bearing surface with radial slots in its ends arranged at an angle to the normal line of force on the bearing: a bottom bearing member having a concave bearing surface with closed ends and with inwardly extending pins at its ends adapted to enter the slots on the lower rod bearing member; an upper rod bearing member having a concave bearing surface with closed ends and inwardly extending pins arranged at its ends and in the direction of the axis of the bearing; and a top bearing member having a convex bearing surface with radial slots at its ends at an angle to the normal line of st am on the bearing and adapted to receive the pins and be j ournaled in the upper rod bearing member.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

FRANK H. NORRIS. DANIEL E. NORRIS.

Witnesses G. D. MoCARrY, LELA MARTIN.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

